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L4937NPD Datasheet(PDF) 5 Page - STMicroelectronics |
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L4937NPD Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 9 page FUNCTIONAL DESCRIPTION The L4937ND is based on the SGS-THOMSON Mi- croelectronics modular voltage regulator approach. Several out-standing features and auxiliary func- tions are provided to meet the requirements of sup- plying the microprocessor systems used in automo- tive applications. Furthermore the device is suitable also in other ap- plications requiring two stabilized voltages. The modular approach allows other features and functions to be realized easily when required. STANDBY REGULATOR The standby regulator uses an Isolated Collector Vertical PNP transistor as the regulating element. This structure allows a very low dropout voltage at currents up to 50mA. The dropout operation of the standby regulator is maintained down to 2V input supply voltage. The output voltage is regulated up to the transientinput supplyvoltageof 40V.This fea- ture avoids functional interruptions which could be generated by overvoltage pulses. The typical curve of the standby output voltage as a functionof the input supply voltage is shown in fig. 1. The current consumption of the device (quiescent current) is less than 260 µA when output 2 is dis- abled (standby mode). The dropout voltage is con- trolled to reduce the quiescent current peak in the undervoltage region and to improve the transient response in this region. The quiescentcurrent is shown in fig. 2 as a function of the supply input voltage 2. OUTPUT 2 VOLTAGE The output 2 regulator uses the same output struc- ture as the standbyregulator, but rated for an output current of 500mA. The output 2 regulator works in tracking mode with the standby output voltage as a reference voltage when the output 2. The output 2 regulator can be switched off via the Enable input. Note : 1: Foldback characteristic ELECTRICAL CHARACTERISTICS (continued) RESET Symbol Parameter Test Conditions Min. Typ. Max. Unit VRt Reset Low Threshold Voltage Vo1 -0.4 4.7 Vo1 -0.1 V VRth Reset Threshold Hysteresis 50 100 200 mV tRD Reset Pulse Delay CT = 100nF; tR > 100 µs 55 100 180 ms tRR Reset Reaction Time CT = 100nF 1 10 50 µs VRL Reset Output LOW Voltage RRES = 10K Ω to V01 VS = 1.5V 0.4 V ILRES Reset Output HIGH Leakage VRES =5V 1 µA VCTh Delay Comparator Threshold 2.0 V VCTh, hyst Delay Comparator Threshold Hysteresis 100 mV Figure 1 : Output Voltage vs. Input Voltage. L4937NPD 5/9 |
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